Method for data transmission via an electric distribution system and transmission system for carrying out the method

• US 4,800,363 A
• Filed: 01/02/1987
• Issued: 01/24/1989
• Est. Priority Date: 01/15/1986
• Status: Expired due to Fees

• Current Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Schranz, Peter, Maibach, Bruno, Hanselmann, Urs, Braun, Walter, Hagmann, Walter
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US07/000,134
• Time in Patent Office: 753 Days
• Field of Search: 340/310 R, 340/310 A, 340/310 CP, 340/538, 340/505, 340/825.06, 323/361, 375/37
• US Class Current: 375/133
• CPC Class Codes: H02J 13/00009 using pulsed signals
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H04B 2203/5416 by adding signals to the wave form of the power source
• CPC Class Codes: H04B 2203/5425 improving S/N by matching impedance, noise reduction, gain control
• CPC Class Codes: H04B 2203/5483 using coupling circuits
• CPC Class Codes: H04B 3/542 the information being in digital form
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 40/121 using the power network as support for the transmission

Abstract

A method and system for the transmission of data in an electric distribution system between a central controller coupled to a medium-voltage distribution line and at least one terminal coupled to a low-voltage wherein, the transmission of data within the medium-voltage distribution line takes place at a first carrier frequency (f₁), and the data at the first carrier frequency is transposed to data at a lower second carrier frequency (f₂₁, f₂₂) for transmission from the medium-voltage distribution line to the low-voltage distribution line by means of a transponder. Due to this transposing of carrier frequencies, the system can be optimized with respect to the different channel properties of the two communication channels.

Claims

1. A method for transmitted data via an electric distribution system having a high-voltage distribution line, a medium-voltage distribution line and a low-voltage distribution line, wherein data are exchanged between a central controller and at least one terminal via the medium-voltage distribution line and the low-voltage distribution line, comprising:

transmitting data on the medium-voltage distribution line at a first carrier frequency in the range between 20 KHz and 140 KHz; and

transmitting data from the medium-voltage distribution line to the low-voltage distribution line at a second carrier frequency in the range between 4 KHz and 20 KHz;

wherein the first carrier frequency is continuously changed and is phase modulated for transmission at the medium-voltage distribution line.

2. A transmission system for transmitting data via an electric distribution system having a high-voltage distribution line, a medium voltage distributution line coupled to said high-voltage distribution line by means of a substation, and a low-voltage distribution line coupled to said medium-voltage distribution line, comprising:

a central controller coupled to the medium-voltage distribution line for transmitting data at a first carrier frequency on said medium-voltage distribution line;

a plurality of transponders coupled to the medium-voltage distribution line for receiving the data transmitted at the first carrier frequency from the medium-voltage distribution line, converting the received data to data at respective second carrier frequencies, and feeding the converted data at the respective second carrier frequencies back to said medium-voltage distribution line, whereby said converted data at said second carrier frequencies is coupled to said low-voltage distribution line;

a terminal coupled to said low-voltage distribution line and including a transceiver for receiving the converted data at said second carrier frequency,

said central controller comprising a transmitter including PSK modulator and a frequency-hopper circuit, and a receiver including a corresponding PSK demodulator and a frequency-hopper circuit, all of which operate within the range of the first carrier frequency;

each said transponder comprising first and second transceivers which operate in parallel, said first transceiver comprising an LF demodulator for demodulating the data transmitted at the respective second carrier frequency and a subsequent PSK modulator and a subsequent frequency-hopper circuit at a transmitter of the first transceiver for modulating the demodulated data and transmitting the modulated demodulated data at the first carrier frequency, and the second transceiver comprising in the reverse order, a frequency-hopper circuit at a receiver of the second transceiver, a PSK demodulator for demodulating data at said first carrier frequency, and an LF modulator for modulating the demodulated data at the respective second carrier frequency, wherein adjacent transponders transpose the data at said first carrier frequency to different second carrier frequencies.